关键词: 洛阳, 植烟土壤, 烤烟, 秸秆还田, 土壤盐分, 土壤养分

Abstract: In order to explore the effects of rotten straw returning on nutrients and salinity of Luoyang tobacco‑growing soil，a field experiment with cultivated tobacco plants was organized in a completely randomized block design，Zhongyan 100 was used as the test variety. On the basis of conventional fertilization，no straw returning（CK），and the rotten straw returning treatments at rates of 6 000 kg/ha（T1），9 000 kg/ha（T2）and 12 000 kg/ha（T3），respectively were set.The contents of soil nutrients and salinity during tobacco growing stages for all the treatments were measured. The results showed that the addition of straw could significantly improve the contents of soil available phosphorus and potassium. The increase of soil available phosphorus and potassium was the largest when the amount of straw returning was 12 000 kg/ha. Compared with CK，addition of straw could decrease the soil pH value，and the soil pH value further decreased with the rates of straw returning increased. The contents of soil Ca²⁺ and SO₄^2‑decreased under the treatments with straw added at rates of 6 000 kg/ha and 12 000 kg/ha，respectively.However，straw returning at a rate of 12 000 kg/ha significantly increased the contents of K⁺，Mg²⁺ and Na⁺.Therefore，application of straw could increase soil nutrients. The straw returning at a proper rate could reduce the contents of Ca²⁺ and SO₄^2‑ in soil，whereas it also increased the contents of K⁺，Mg²⁺ and Na⁺.

Key words: Luoyang, Tobacco?growing soil, Flue?cured tobacco, Straw returning, Soil salinity, Soil nutrient